Danish manufacturer TC Electronic has been making audio interfaces and studio effect processors since the 1980s and has since developed some great effect pedals. Superior to comparable delay units of the time, the TC2290 rack mounted delay eventually led to the release of the Flashback Delay available as a small footprint stompbox and large X4. Their PolyTune and PolyTune Mini pedals show up on a lot of pedalboards along with Ditto Looper, Hall of Fame Reverb, and DSP Nova Series.